It is voluetric rotary piston water meter with NSF approval NSF Approval Volumetric Piston Brass Remote Reading Gallon Water Meter
Features · Ensures high sensitivity and accurate registration throughout a wide flow range · Mechanical transmission movement equates to maximum reliability · Corrosion resistant body · Liquid sealed register, easy reading and long time clear reading · Low starting flow rate · Internal non return valve, internal strainer · Install in any position · Plastic meter body